Filter element



Jul y 25, 1944. A. E. MASON 2,354,3

FILTER-ELEMENTS I Filed Feb. 12, 194:5

13 MIT-w IN V EN TOR.

Patented m, as, 1944 Adam Edward Mason, Delleville, Mich, assignor to Ralph L. Skinner, Detroit, Mich.

Application February 12, 1943, Serial No. 475,614 2 Claims. (01. 210-169),

This invention pertains to features of superiority and excellence in filter-packs of the edge-filtration type for use in a filter employing one or more of such improved filter-elements, each composed of a series or group of superposed, apertured, registered, thin sheets held together in face-to-face contact, but with shallow spaces between them because of their somewhat rough surfaces.

The invention relates more-particularly to illter-packs of this general form which are relatively H of crepe-paper, whose rugosities II, as shown, extend crosswise the strips to increase the capacity, rapidity and uniformity of the filtering ac- T tion, each such strip (Figure 2) having a line of spaced-apart, round apertures l3 therethrough, the plurality of these strips being in registered relation, whereby their aligned apertures pro- -vide the corresponding number of internal, cy-

flat, or more or less nearly so, which style of structure facilitates their efiective and facile cleaning, especially their external surfaces.

Such outer surfaces of the pack are so shaped as to improve the efficiency and uniformity of the filtration as well as increasing the capacity of the filter-pack.

Among the several advantages accruing from the employment of this invention may be mentioned in some cases a more rapid filtering action,

and a more economical employment of the paper used in making the separate thin sheets of paper of which the pack is composed.

Filter-elements of this general shape have been heretofore suggested in United States Patents 1,557,585 and 1,744,510, but the current invention concerns certain features of improvement and betterment in such earlier structures, whereby to secure the above stated and other desirable aims and objects. 7

To permit those having knowledge of this art to understand the invention both from an embodiment of the same in desirable physical form and, from the advantages resulting therefrom, a present preferred incorporation of the invention in filter-media has been illustrated in the accom panying dra wing forming a part of this specification and to whichreference should be had in connection with the'following detailed description, and, for convenience and simplicity, like reference numerals have been employed in such drawing to designate the same structural parts or elements in the several views.

In this drawing Figure 1 illustrates the method of making the paper strips of which the filter-pack is made up;'

Figure 2 is a face view of one of such strips; Figure 3 is a perspective view on a smaller scale of a complete filter-pack; and v Figure 4 is an enlarged section on line 4-4 of Figure 3.

The completed filter unit or assemblage, as portrayed in Figure 3, is composed or built up of a relatively-large number of stripsor ribbons lindrical passages orcavities l4.

The rough paper-strips are impregnated with a suitable agent, depending upon the use to which the filter-pack is to be put, in the present instance, Beckophen, a phenolic-resin. which, when polymerized, is impervious to, and not detrimentally affected by, any of the materials or substances with which the pack will come in contact during the filtration, ,the polymerizing of such agent under suitable heat treatment also causing the strips, which are held pressed together during such procedure, to become permanently and fixedly adhered together, whereby the pack then constitutes a unit assembly without, however, interfering with the proper passage of the fluid, liquid, or gas, undergoing filtration between the strips thus cemented together.

An important and valuable feature of this construction is-the shapes of the two opposite surfaces of the pack, in that they are ribbed or rounded, as shown at l5, l5, concentrically with,

-and lengthwise of, their internal cylindrical passages, thus' increasing the areas of these outside surfaces and in greater measure rendering more uniform the distance between the external opposed surfaces of the pack and the inner ducts, hence affording greater capacity of the pack and giving increased uniformity of filtration by providing a greater number of rugosities of equal, or

substantially equal, lengths from the outside of the pack tothe interior of such conduits.

To supply the plurality of individual, appropriately-shaped', elongated, crepe-paper strips for the production of one of the novel filter-elements, the means shown in Figure 1 is at present preferably employed, although other or comparable means may be'used, if preferred.

To this end, a long band or sheet i6 of suitable crepe-paper with .its surface ribs or rugosities disposed lengthwise thereof, and impregnated with the specified agent, which, when polymerized, is unaffected by the fluid to be filtered and/or by any of the contaminants with which it is charged, and which polluting media is to be separated out by the filtering operation, is unwound progressively from a roll or other supply, not shown, and is fed along step-by-step, with intervening stationary periods, by any appropriate mechanical means or by hand, and during each such interval of non-travel, a relativelysmall, advance section thereof is subjected to the simultaneous punching-out action of a number or punches IT, I 8 and i9 coacting with companion dies not illustrated because they will be well understood.

The punches I! are preferably, but not necessarily, round and one-half or the edges of the symmetrical dies l8 and I! are concentric with the adjacent parts of punches l1.

After the three types of punches have thus provided correspondingly-shaped holes or apertures through one transverse portion of the sheet, the punches rise and the sheet is fed along,

to bring the next adjacent cross-portion of the sheet into register with the punches, which then descend and repeat their punching operation, and so on repeatedly, whereby the sheet is cnsumed in this manner.

Each time that the punches act, a. straight cutting-blade, not shown, severs the previously punched-out part of the sheet along a line 2|, 2| passing through the centers of one row of the symmetrical openings H8 and N9 made by the complementary punches l8 and I9, whereby durin each punching and cutting operation, a .finished or completed strip ll of the form and style shown in Figure 2 is supplied.

After a suitable number of these strips have been thus made, theyare stacked on top of one another in registered fac'e-to-face relation, as presented in perspective in Figure 3, and, while pressed together, their impregnating protective agent is polymerized under suitable heat, which change not'only renders such agent effective to protect the strips against injurious action thereon by the materials with which they will come in contact during the filtering operation, but it also causes the strips to adhere together by means of such agent so that the pack or stack constitutes an easily handled unit, as portrayed in Figure 3.

Those acquainted with this art will readily I I of a series of strips impervious to the media with which they will come in contact during the ill-v tration and each having a row of round apertures therethrough, said strips bein in registered relation and with their corresponding apertures in registration forming cylindrical passages the novel improvement being that sections of opposite faces of the pack are each substantially concentric with the inner surface of the pack defining a portion of the adjacent passage.

2. The novel improvement set forth in claim 1, including the additional novel improvement that said strips are of crepe-paper with their rugosities extended crosswise the strips, said strips being impregnated with an agent rendering them impervious as stated, said agent also adhering the strips together without closing the spaces between the strips. A

ADAM EDWARD MASON. 

